Wearing a dramatic beaded dove-gray gown, complete with sequin detailing and a long train streaming out behind her, the "Red" songstress perched at the piano for what was billed as an "intimate performance" of her song "All Too Well."

Backed by a band and supporting vocalists, Swift played the ballad — which is rumored to be about her blink-and-you'll-miss-it-yeah-you-missed-it relationship with actor Jake Gyllenhaal — fairly straight, until the song's bridge, at which point she flipped out into a straight-up headbang.

Before the performance, fans wondered which song Swift would choose to perform. After all, fan favorite Ed Sheeran, who duetted with Swift on "Everything Has Changed" on the album, was in the house for the awards show, and "I Knew You Were Trouble" topped charts earlier this year.

However, when Swift set her mind to tickling the keys, fans exploded with appreciation on Twitter, wholeheartedly approving of the song choice. In fact, several even thanked Gyllenhaal for inspiring Swift.